Positioning clamp special for machining of steel backing for high-speed rail

Abstract

The utility model relates to a special positioning fixture for processing a steel backing for a high-speed rail, which comprises a fixture seat body detachably mounted on a working table of a processing machine tool, and an external contour positioning groove which has the same shape as the external contour of the steel backing to be processed and is used for embedding the steel backing is arranged on the fixture seat body; corresponding fluctuations are arranged on the bottom face of the outer contour positioning groove corresponding to the fluctuations of the lower face of the steel backing to be machined, and circular grooves with the receding function are formed in the corresponding positions of the bottom face of the outer contour positioning groove corresponding to a plurality of holes which need to be machined and are formed in the steel backing. The round grooves located in the front row position, the middle row position and the rear row position are selected to be round grooves with the positioning function, threaded holes are formed in the round grooves with the positioning function, and first fixing bolts are correspondingly arranged in the threaded holes in a matched mode. And positioning and pressing structures for fixedly pressing the steel backing to be machined are arranged outside the front end and the rear end of the outline positioning groove. According to the utility model, the processing efficiency can be greatly improved, the yield can be improved, and the requirement of high-precision processing technology can be ensured.

Description

Technical Field

[0001] The utility model relates to a special positioning fixture for processing steel backs for high-speed railways. Background Art

[0002] my country's high-speed rail design is already world-leading. At present, all parts of my country's high-speed rail locomotives have basically been domestically produced. Many of its parts have special structures and involve technical secrets that need to be protected. Therefore, in order to protect the technology, many of its parts need to be processed by different manufacturers in actual processing to process different parts and structures of a workpiece.

[0003] The steel back for high-speed rail locomotives is one of the important components of brake pads used in the braking system of high-speed rail locomotives. It is a non-standard part with a unique structure. After the previous processing, it is also necessary to complete the milling of dovetail grooves in our factory, as well as the processing of up to 11 special holes and other parts and structures. Due to the uniqueness and non-standard nature of the steel back structure, when it is processed on a milling machine, if conventional holding tools are used, it requires repeated disassembly and repositioning operations. The steel back for high-speed rail locomotives has very high requirements and standards for processing accuracy, tolerance and other processes. The use of conventional fixtures is not only inefficient, but also often improper operation leads to the failure to guarantee accuracy and tolerance requirements. In addition, the steel back for high-speed rail is relatively thin. When it adopts the ordinary clamping and positioning method, the special convex structure on the lower part of the steel back will cause the workpiece to vibrate easily during processing after ordinary clamping and positioning, making it difficult to meet the process requirements. Therefore, it is necessary to design and develop special positioning and clamping tools. Utility Model Content

[0004] The technical purpose of the utility model is to provide a special positioning fixture for processing steel backs for high-speed railways, which can greatly improve processing efficiency, increase output, and ensure the requirements of high-precision processing technology.

[0005] In order to achieve the above technical purpose, the technical solution adopted by the utility model is:

[0006] A positioning fixture specially used for processing steel backs for high-speed railways comprises a fixture seat body detachably mounted on a working table of a processing machine tool, an outer contour positioning groove having the same shape as the outer contour of the steel back to be processed and used for correspondingly embedding the steel back to be processed is provided on the fixture seat body; the bottom surface of the outer contour positioning groove is provided with corresponding undulations corresponding to the ups and downs below the steel back to be processed, and a circular groove having a giving way function is provided at a corresponding position on the bottom surface of the outer contour positioning groove corresponding to the arrangement of a number of holes required to be processed on the steel back to be processed, among which the circular grooves located in the front, middle and rear rows are respectively selected as circular grooves having a positioning function, a threaded hole is provided in each circular groove having a positioning function, and a fixing bolt is provided correspondingly; positioning and clamping structures capable of fixing and pressing the steel back to be processed are respectively provided on the outside of the front and rear ends of the outer contour positioning groove.

[0007] Furthermore, the positioning and clamping structure for fixing and pressing the steel back to be processed described in the utility model includes two clamping blocks and threaded holes arranged on the outside of the front and rear ends of the outer contour positioning groove. A positioning through hole is opened on each clamping block, and two fixing bolts are respectively provided.

[0008] The operation process of the above-mentioned positioning fixture of the utility model when used is: embed the steel back whose outer contour has been processed and shaped (completed by the previous manufacturer) into the outer contour positioning groove of the positioning fixture, and press the steel back onto the positioning fixture of the utility model through the positioning and clamping structures at both ends of the fixture; then firstly process the process threads on the steel back and in the circular holes corresponding to the positioning circular grooves on the fixture, and then disassemble the positioning and clamping structure; and position and fix the steel back on the fixture through the process threads just processed on the steel back by fixing bolts; then use the processing machine tool to start the corresponding processing of milling dovetail grooves and other special holes on the steel back; after the above-mentioned processing is completed, remove the fixing bolts on the steel back, and press and fix the steel back again with the positioning and clamping structures at both ends of the fixture, and then remove the process threads in the holes with process threads on the steel back and process the remaining holes as required.

[0009] The beneficial effects of the utility model are:

[0010] The special steel back for high-speed rail requires multiple processing steps due to its special outward-expanded shape and structure. The utility model is used on a milling machine processing station after the outer contour shape of the steel back and the special hole 4 have been positioned and preliminarily processed. The use of this special fixture can efficiently complete the milling of dovetail grooves, special holes and other processes. It can ensure the correct positioning of the special steel back for high-speed rail during the processing, maintain the processing rigidity, ensure the processing accuracy, and greatly improve work efficiency. The special steel back for high-speed rail is thin and has a special shape. The use of ordinary steel back fixtures requires multiple positioning, and because it is thin, it will generate vibration, making it difficult to ensure processing accuracy. The outer contour positioning groove designed by the utility model can ensure that no harmful vibration will be generated during the processing of the steel back. The process thread can be processed by utilizing the aperture of the steel back in this application, which can very conveniently complete the processing of the special dovetail groove shape on the surface of the steel back. Combined with the positioning and fixing devices designed at both ends of the fixture, all processing projects of the steel back on the milling machine station can be efficiently completed with high efficiency, fast speed, high and guaranteed processing accuracy. The utility model has high processing volume and short completion time, and can meet the customer's order requirements with guaranteed quality and quantity. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the positioning fixture and the steel back assembly positioning of the utility model.

[0012] Figure 2 This is a separate structural schematic diagram of the positioning fixture of the utility model.

[0013] Figure 3 This is a schematic structural diagram of the special steel back for high-speed railways described in the utility model.

[0014] In the figure: 1 clamp seat, 2 steel back, 3 outer contour positioning groove, 4 circular groove, 4-1 also positioning circular groove, 5 fixing bolt one, 6 clamping block, 7 fixing bolt two. DETAILED DESCRIPTION

[0015] As attached Figure 1 , 2 3 shows an embodiment of a special positioning fixture for processing steel backs for high-speed railways of the utility model. It includes a fixture seat 1 that can be detachably mounted on a processing machine table, and an outer contour positioning groove 3 for correspondingly embedding the steel back to be processed is provided on the fixture seat 1, which has the same shape as the outer contour of the steel back 2 to be processed; the bottom surface of the outer contour positioning groove 3 is provided with corresponding undulations corresponding to the ups and downs below the steel back to be processed. Corresponding to the arrangement and layout of the several holes required to be processed on the steel back 2 to be processed, a circular groove 4 for giving way and positioning is provided at a corresponding position on the bottom surface of the outer contour positioning groove 2, and the circular grooves located in the front, middle and rear positions are respectively selected as positioning circular grooves 4-1, and threaded holes are provided in each corresponding positioning and positioning circular groove 4-1, and corresponding fixing bolts 5 are provided. Positioning and clamping structures that can fix and press the steel back to be processed are respectively provided on the front and rear ends of the outer contour positioning groove 3. It comprises two clamping blocks 6 and threaded holes arranged on the outside of the front and rear ends of the outer contour positioning groove 3. A positioning through hole is respectively opened on each clamping block 6 and is respectively provided with two corresponding fixing bolts 7.

[0016] Application of the utility model

[0017] The method is as follows: a steel back whose outer contour has been processed and shaped is embedded in the outer contour positioning groove of the positioning fixture, and the steel back is pressed onto the positioning fixture of the utility model through the positioning and clamping structures at both ends of the fixture; then, process threads are first processed on the steel back and in the circular holes corresponding to the positioning circular grooves on the fixture, and then the positioning and clamping structure is disassembled; and the steel back is positioned and fixed on the fixture through the process threads just processed on the steel back by fixing bolts; then, a processing machine tool is used to start the corresponding processing of milling dovetail grooves and other special holes on the steel back; after the above processing is completed, the fixing bolts on the steel back are removed, and the steel back is pressed and fixed again by the positioning and clamping structures at both ends of the fixture, and then the process threads in the holes with process threads processed on the steel back are processed and the remaining holes are processed in place as required.

Claims

1. A special positioning fixture for high-speed rail steel back processing, characterized in that: The positioning fixture includes a fixture base body that can be detachably mounted on a working table of a processing machine tool, and an outer contour positioning groove corresponding to the outer contour of the steel back to be processed and used to embed the steel back to be processed is provided on the fixture base body; the bottom surface of the outer contour positioning groove is provided with corresponding undulations corresponding to the ups and downs below the steel back to be processed, and corresponding to a number of holes that need to be processed on the steel back to be processed, a circular groove that plays a giving way role is provided at a corresponding position on the bottom surface of the outer contour positioning groove, among which the circular grooves located in the front, middle and rear rows are selected to be circular grooves with a positioning function, and a threaded hole is provided in each circular groove with a positioning function, and a fixing bolt is correspondingly provided; positioning and clamping structures for fixing and pressing the steel back to be processed are respectively provided on the outside of the front and rear ends of the outer contour positioning groove.

2. A special positioning fixture for processing steel back for high-speed railway according to claim 1, characterized in that: The positioning and clamping structure for fixing and pressing the steel back to be processed includes two clamping blocks and threaded holes arranged on the outside of the front and rear ends of the outer contour positioning groove. A positioning through hole is opened on each clamping block and is respectively equipped with two corresponding fixing bolts.

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